The wires are tucked away behind the logic board, close to the Bluetooth wire. They're harnessed together as three wires labeled 1, 2 and 3. I used a small jeweler's screwdriver to feel for the wires and gently pull them out of their "hiding place."
And IIRC from doing mine, you connect wires 1 and 3 (the shorter wire to the top connector and the longer one to the bottom connector). Wire 2 gets tucked away.
Snapping the wires on the card is a PITA and takes lots of patience. It helps to connect the wires to the card first and then mount it in the socket.